HỆ THỐNG ĐÁNH LỬA CỦA ĐỘNG CƠ CÓ 1 HOẶC 2 CẢM BIẾN KNK TRÊN XE AUDI 100 200 ĐỞI 1989-1991

HỆ THỐNG ĐÁNH LỬA ĐỘNG CƠ 1 HOẶC 2 KNK TRÊN XE AUDI 100_200 ĐỜI 1989-1991

Ignition System

Engine Code MC Ignition wires/connectors, rotor arm

mw checking 28.13 Safety guidelines

w checking 28.19 Ignition coil

@ checking 28.18 Technical data

m chart 28.14

Ignition data 1989 M.Y | U.S.A./Calif./Canada

Ignition timing

Timing mark location: on flywheel (Not adjustable: marks on distributor body and aperture rotor should line up with cylinder no 1 at TDC)

(vacuum advance:retard) manifold pressure and position of

throttie plate are monitored by control unit for electronic ignition after each engine rotation Checking not necessary

Beru RS35 or 14-7DTU

electrode gap mm (in.) 0.7 + 0.1 (0.028 + 0.004)

_ _ tightening torque Nm (ft Ib) 20 (14)

Engine speed limiter switching OFF RPM | * 6700 = 200 CO-content

(oxygen sensor probe

(oxygen sensor probe connected as control) 0.3-1.2 vol %

Ignition System

Safety guidelines

To prevent injury to persons or damage to the

« ignition system observe the following safety guidelines:

Connect and disconnect tester leads to

ignition system only when ignition ts switched OFF

Do NOT connect any capacitors or test lights to terminal 1 of coil

When high tension cable (terminal 4

from coil) is disconnected from

distributor, always connect it directly to ground using jumper cable Otherwise

engine must NOT be cranked with starter (such as with compression test)

Fast charging may only be used for emergency starting for up to 15 seconds maximum with no more than 16.5 volts

Wait at least one minute after each starting attempt

Do NOT replace iQnition coil with conventional type coil

Battery must be completely disconnected

when using arc, spot, or electrical

welding equipment

if components are heated above 80°C (176°F) such as from paint drier or steam

cleaner, wait for components to cool

down before starting engine

Do NOT wash engine while it is running

or ignition is switched ON

Do NOT disconnect battery with engine running

High tension ignition cable must be

suppressed with at least 2 K 9 (with 1K ohm at rotor)

Do NOT apply voltage to the control unit

to simulate output signais

>

setety gudeines O03

Ignition timing reference sensor, checking

> @ unpiug (black) harness connector 3 from

plenum panel mounting

® connect multimeter US 1119 between

terminals 1 and 2 of male connector

® check wiring and connections between

sensor harness connector C and control unit harness connector A as follows

® remove ignition control unit cover panel located on passenger side footwell

m disconnect control unit harness connector A

w using multimeter US 1119, check between

terminals of reference sensor harness

cennector C and control unit harness

Engine code MC with one knock sensor Turbo | ‘gnition timing reterence 28 4 sensor, checking a

Ignition System

@ replace control unit

Engine RPM sensor, checking

@ unplug (gray) harness connector 2 from plenum panel mounting

® connect multimeter US 1119 between terminals 1 and 2 of male connector

@ =x 2 (open)

Engine code MC with one knock sensor Engine RPM sensor, checking 28 5

@ check wiring and connectors between

sensor harness connector C and control unit harness connector A as follows

@ remove control unit cover panel located on

passenger side footwell

@ disconnect control unit harness connector A

® using multimeter US 1119, check between

terminals of sensor harness connector C and control unit harness connector A

Terminals of connector A

Terminals of connector C |

if YES

@ replace control unit

Engine code MC with one knock sensor Engine RPM sensor, checking 28 a 6

Ignition System

Hall sending unit, checking

Check this first:

® ignition coil wire from distributor must be disconnected and grounded

m disconnect harness connector from Hail control unit (arrow)

@ connect multimeter US 1119 to terminals 1

and 3 of Hall sender harness connector D

@ switch ignition OFF

m peel back boot on Hal! sending unit

a

CAUTION Distributor cap retaining clips must not interfere with Hall sending unit during

® 40 volts minimum

Engine code MC with one knock sensor Hall sending unit, checking 28.7

@ check voltage reading

® 0-0.5 voits

® switch ignition OFF

If NO m™ replace Hall sending unit

if YES

gs check wiring for open circuit between Hall sending unit and control unit harness connector using wiring diagram

®@ remove contro! unit cover located in footwell on passenger side of vehicle

@ unplug control unit connector A

@ use multimeter US 1119 to check continuity

between terminals of Hail sender connector

D and contro! unit connector A

if YES

™@ repiace Hall control unit

Engine code MC with one knock sensor Hall sending unit, checking 28 28

Ignition distributor, basic adjustment

Check this first:

@ ignition switched OFF

@ turn crankshaft using tool 2079, to TDC position (arrow)

m™ mark on camshaft sprocket must align with upper edge of valve cover gasket (arrow)

® remove ignition distributor cap

w remove rotor and dust cover 8ø loosen distributor at mounting nut

@ turn distributor housing so mark on rotor aligns with mark on distributor housing (arrows)

™ tighten distributor mounting nut

Ignition coil (with power stage), checking

® disconnect ignition coil power stage 1

™ remove coil wire from ignition coil 2

switch ignition ON

® approximately 12 volts

if NO

® repair break in wiring using wiring diagram

®™ connect multimeter US 1119 between terminals 2 and 3

@ crank engine with starter

® minimum 0.2 volts

lf NO

® check wiring between terminal 2 of connector and terminal 22 of ignition control unit according to wiring diagram

If no break in wiring can be determined

@ replace ignition control unit

IS stage and engine for corrosion or damage

Two different ignition coils are being used on

\ this engine Follow the instructions for the rsion that is found on the repair vehicle

nnect igntion coil power stage (arrow)

ve coil wire from ignition coil

@ replace ignition coil

if all specified values are obtained in tests of ignition coil with power stage and the engine still does not run (no ignition impulse)

@ replace ignition coil with power stage

Ignition System

Ignition wires/connectors, rotor arm, checking

@ use multimeter US 1119 for the following resistance measurements

check ignition wires

@ between coil and distributor with radio: 2000 + 800 ohms

without radio: 0 ohms

e@ between distributor and spark plug with radio: 6000 + 1400 ohms without radio: 1000 + 400 ohms

check spark plug connector 1 resistance

@ with radio (suppressed):

Rotor must be marked with R 1 (for Hall

generator equipped cars)

ignition wires/connectors and 28

rotor arm, checking ol 3

Engine code letters MC

0

E1

throttle plate are monitored by control unit for electronic ignition after each engine rotation Checking not necessary

electrode gap mm (in.} 0.7 + 0.1 (0.028 + 0.004) tightening torque Nm (ft Ib) 20 (14)

Engine speed limiter = switching OFF RPM 6700 + 200 CO-content

(oxygen sensor probe

-‘ adjusting value 0.6-1.0 vol %

(oxygen sensor probe connected, as control) 0.3-1.2 vol %

Ignition coil secondary resistance 6.5 — 8.0 K-ohm

primary resistance 0.5 — 1.5 ohms

@ remove glove compartment

Ignition coil contro! function,

checking

a ™ remove power output stage harness

connector 1 and coil wire 2 from ignition

mã switch ON ignitian

®@ approximately 12 voits

If voltage value is NOT obtained

@ check for break in wiring using wiring diagram, repair as necessary

® connect multimeter between terminals

if voltage value tS obtained,

g check ignition coil

If voltage yalue is NOT obtained

mw check wiring between terminal 2 of harness connector and terminal 22 of engine control unit harness connector using wiring

diagram

if NO break in wiring is found

w replace engine control unit

Engine control unit,

j removing/installing Ignition coil 28

Engine code MC with two knock sensors control function checking „15

ignition coil, checking

Check wiring between power output stage and ignition coil and between power output stage ground strap and engine for corrosron

or damage replace or repair as necessary

m disconnect harness connector 1 from power

output stage of ignition coil

®@ remove screw 3 m@ switch multimeter US 1119 to resistance range

Secondary resistance, checking

- ™ remove all connectors from ignition coil

® connect multimeter between terminals 1 and 4 of ignition coil

® 5000-9000 ohms

If resistance vaiue is NOT obtained

§ replace ignition coil Primary resistance, checking

® remove all connectors from ignition coil

® connect multimeter between terminals

1 and 15 of ignition coil

e 0.5-1.5 ohms

If resistance value is NOT obtained

® replace ignition coll

of the coil can NOT be checked

Engine code MC with two knock sensors ; Ignition coil, checking 2 8.16

ignition System

Engine speed sensor, checking

m™ separate (gray) speed sensor harness

connect multimeter between terminals

1 and 2 of the speed sensor harness

connector

®@ approximately 1000 ohms

if resistance value is NOT obtained

® replace engine speed sensor

- If resistance value IS obtained

@ connect multimeter between terminals

1 and 3, then between terminals 2 and 3

®@ infinite ohms (open)

If infinite resistance is NOT obtained

@ repiace engine speed sensor

if infinite resistance IS obtained

@ check wiring between speed sensor harness connector and engine control unit

harness connector as follows:

remove engine control unit then disconnect control unit harness connector

check continuity between control unit

harness connector A and speed sensor harness connector C as follows:

If continuity is NOT obtained

@ check wiring using wiring diagram, make

repairs as necessary

wea as as a ae 4s If continuity IS obtained

@ replace engine control unit

ition timing sensor, checking

#8 separate black harness connector 1 on plenum

B® connect multimeter terminals 1 and 2 of

harness connector

® approximately 1000 ohms

If resistance value is NOT obtained

âm replace ignition timing sensor ~

If resistance value IS obtained

™ connect multimeter between terminals

1 and 3, then between terminalis 2 and 3

@ infinite ohms (open)

If infinite resistance is NOT obtained

w replace ignition timing sensor

If infinite resistance IS obtained

mã check wiring between sensor harness connector and engine control unit harness connector as follows:

@ remove engine control unit then disconnect control unit harness connector

m™ check continuity between timing sensor harness connector C and control unit

harness connector A

Sensor connector C Connector A

† =——————~+ l3 2=——————~ !2 34=————~ 28

If continuity is NOT obtained m@ check wiring using wiring diagram, make repairs as necessary

If continuity IS obtained m@ check air gap between timing sensor pin and flywheel (see Group 13)

If gap is OK

@ replace engine control unit

Engine code MC with two knock sensors Ignition timing sensor, checking 28.18

Ignition System

Hall sensor, checking

CAUTION Disconnect the power output stage of the ignition coil BEFORE checking the Hall

§ switch multimeter US 1119 to 20 volt range

and connect to terminals 1 and 3 of

connector D

switch ON ignition

® 9 volts minimum

\f voltage value is NOT obtained

a check wiring using wiring diagram, make repairs as necessary

if voltage value 1S obtained

w switch OFF ignition m™ push back rubber grommet on Hall sensor harness connector

® connect multimeter between terminalis

1 and 2 re-connect Hall sensor (on ignition distributor)

switch ON ignition remove ignition distributor cap, rotor, and dust shield

CAUTION

Do NOT allow distributor cap clips to tilt

into the distributor and thus contact the Hall sensor

turn crankshaft using special tool 2079 until trigger wheel shutter completely blocks Hall sensor

® 0-0.5 volts minimum

m switch OFF ignition

If voltage values are NOT obtained

8 replace Hall sensor

If voltage values ARE obtained

® check wiring between Hall sensor harness connector and engine control unit harness

check continuity between wires of Hall

sensor harness connector D and control

unit harness connector A:

Connector D Connector A , 2—=———————~ 27

If continuity is NOT obtained

® check wiring using wiring diagram, and make repairs as necessary

Ignition System

Ignition distributor, basic setting

(Static check, engine NOT running)

>> # tum crankshaft to TDC using special tool

@ remove ignition distributor cap

âm remove distributor rotor and dust shield

w drill out shear bolt and tab (that conceals distributor clamp bolt)

w loosen distributor clamp

wheel lines up with marking on distributor (arrow)

@ tighten distributor base clamp nut

Ignition distributor, basic setting

(dynamic check, engine running)

@ connect US 1115 LED tester (using

US -1115 : between rear terminals of black diagnostic

connect adaptor leads from VW 1594

to front terminals of diagnostic connectors

1 and 2 join connectors A and B start engine and let run at idle separate connectors A and B after about

4 seconds

@ US 1115 must NOT light up or flash

US 1115 lights up or flashes switch OFF engine

loosen distributor base clamp start engine and let run at idle rotate distributor housing until US 1115 goes out (with the engine running)

m tighten distributor base clamp nut install new shear bolt to conceal clamp nut